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THE GENETIC RELATIONSHIP BETWEEN NAMA HISPIDUM and NAMA STEVENSII by FATHI BASHIR ERTEEB Bachelor of Science Elfateh University

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THE GENETIC RELATIONSHIP BETWEEN NAMA HISPIDUM and NAMA STEVENSII by FATHI BASHIR ERTEEB Bachelor of Science Elfateh University THE GENETIC RELATIONSHIP BETWEEN NAMA HISPIDUM AND NAMA- STEVENSII By FATHI BASHIR ERTEEB ;/ Bachelor of Science Elfateh University 'I'ripoli, Libya 1976 Submitted to the Faculty of the Graduate College of the Oklahoma State University in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE May, 1983 T ha..,~1s 19~ ~., . E "l'?::i~ u1~~\ '1.. .... : THE GENETIC RELATIONSHIP BETWEEN NAMA HISPIDUM AND NAMA STEVENSII Thesis Approved: li 1153186 i ACKNOWLEDGMENTS I would like to express my sincere and deep appreciation to my major adviser Dr. Ronald J. Tyrl, for his invaluable advice, guidance, and encouragement throughout the course of this study. I gratefully thank Dr. Paul E. Richardson and Dr. Glenn Todd for serving as members of my committee and for their many helpful suggestions. Again I thank Dr. Paul E. Richardson and extend my thanks to Mr. Dave Ferris for their assistance in the use of the flourescent microscopy. Special thanks for my wife, Ftayem, my son Aymen and daughter Huda for their patience and sacrifice provided throughout the stay in the United States far from our family and not being able to see them for three and a half years. I wish also to thank Tina Ahern, Sandra Nobbe, and Donetta Bantle for the typing of this thesis. iii TABLE OF CONTENTS Chapter Page I. INTRODUCTION 1 II. TAXONOMIC TREATMENT 6 III. STUDY SITES 13 IV. MORPHOLOGY • 23 V. GENETIC RELATIONSHIP • . .. 26 VI. CONCLUSIONS 44 BIBLIOGRAPHY 46 iv LIST OF TABLES Table Page I. Summary of Hitchcock's Treatment of Nama 10 II. Section Eunama Annual Species and the Position of Nama hispidum and Nama stevensii . 11 III. Nama hispidum and Nama stevensii Collection Sites ••••.•• '. 15 IV. Summary of Fruit and Seed Set in Hybrid­ ization Experiments • • • . • • •• 27 V. Results of Exper-irnental Hybridization 28 v LIST OF FIGURES Figure Page 1. Distribution of Nama hispidum and Nama stevensii in the United States and Mexico • . • • . • . • . • . • • . 2 2. Collection Sites of Nama hispidum and Nama stevensii Used in Crossing Experiments • 14 vi CHAPTER I INTRODUCTION The genus Nama in the Hydrophyllaceae is composed of 18 annual species with 16 varieties and 20 perennial species and six varieties. Thus the genus includes 60 variable taxa. More than one-half of the species are distributed in the drier habitats of the southwestern United States and northern Mexico. There are five species in South America, two in the Caribbean, and one in Hawaii. Many of the taxa are restricted ·to a particular soil type while others do not exhibit this restriction for soil type. In southwestern Oklahoma and adjacent Texas, Nama is represented by only two species (Hitchcock, 1933b; Water­ fall, 1969; Correll and Johnston, 1970). One is Nama stevensii collected by George W. Stevens in 1913 from near Alva in Woods County, Oklahoma, and described by C. L. Hitchcock when he monographed the genus in 1933. Nama stevensii is an obligate gypsophile found growing only on gypsum soils of western Oklahoma, Texas, and Mexico (Figure 1). The second taxon is N. hispidum and was described by Asa Gray in 1861. It is an extremely variable and wide­ spread taxon found on sandy, gravelly soils. Plants are not 1 2 NAMA H\SP\OUM NAMA STEVENS\\ figure 1. Distribution of in the United States Naro•~~Mexico. and~~ 3 found on gypsum soils. Populations of ~· hispidum occur from southwestern Oklahoma and Texas to southern California and northern Mexico (Figure 1). Nama stevensii and ~· hispidum apparently are very closely related species. They differ, in addition to - soil type, in the nature of the pubescence, leaf shape and size, and the level of stamen filament insertion and the degree of filament fusion with the corolla. These charac­ ters are emphasized in the taxonomic keys used to different­ iate the two taxa (Hitchcock, 1933b; Waterfall, 1969; Correll and Johnston, 1970). Nama stevensii is characterized by appressed hairs, linear-lanceolate leaves, and the adnate portion of the filament is much wider or dilated at the base than the free portion. In contrast N. hispidum has hispid hairs, linear-oblong to obovate leaves, and the adnate portion of the stamen filament is not much wider than the free portion. Further,~· stevensii has a rounded appearance because it bears branches at the base with the upper branches and leaves crowded; whereas, ~- hispidum appears to be more erect due to the lack of branching at the base and less crowding of the upper branches and leaves. Even though these two taxa have been accepted as two species (Hitchcock, 1933b; Waterfall, 1979; Correll and Johnston, 1970), there is still some questions as to whether the taxa are distinct. It was suggested by Correll and Johnston that N. stevensii may be only a gypsophilous 4 phase of ~· hispidum. I. M. Johnston described a gypso­ philic variety of ~· hispidum from Nuevo Leon, Mexico in 1941 ~· hispidum var. gypsicola. Bacon (1974), how­ ever, believed that the affinities of this variety lay closer to ~- stevensii than to ~- hispidum, except for its prostrate habit, its shorter less dense pubescence, and its smaller leaves and in 1982 renamed the taxon as N. stevensii var. gypsicola. Preliminary studies of N. stevensii and N. his- pidum by Tyrl <unpublished) revealed variability and over­ lap in the characters used to distinguish the two taxa. In addition, Benenati <1974) suggested that these two taxa exhibited phenotypic plasticity on the basis of her investi­ gations of their ecology. Moreover, the presence of a population with plants identifiable as both N. stevensii and N. hispidum along the bluffs of the Red River in Harmon County, Oklahoma, suggests the taxa may not be dis­ tinct entities. Nama, a most interesting genus, has received little detailed investigation since Hitchcock monographed the genus in 1933 and published additional work on Mexican species in 1939. During their investigations on the chromosome number of the Hydrophyllaceae, Constance and Cave (1947, 1950, 1959) and Constance (1963), reported chromosome numbers for about one-third of the species described by Hitchcock. Bacon (1974) reported chromosome numbers for about one-half of the species. Counts were also made by Tyrl et al. (1977). 5 The results of all three studies are smiliar. All plants exhibited a base chromosome number of seven with both N. hisoidum and ~- stevensii having 2~=14. Biosystematic study of N. stevensii and N. his- pidum was initiated by Tyrl in 1973. Grummer (1977) work­ ing with Tyrl studied the reproductive biology, analyzed the patterns of the morphological variation, characterized the flavonoid patterns by chromatography, and made intra- and interspecific crosses. However, the genetic information col­ lected by Grummer was imcomplete and the genetic relation­ ship of the two taxa was unresolved and needed to be clarified. Therefore, the objective of my study was to con­ duct an investigation of the genetic relationship of N. stevensii and ~· hispidum. Work involved a determina- tion of stigma receptivity, pollen fertility, selfcompati­ bility, and most importantly the genetic compatibility between the two taxa. CHAPTER II TAXONOMIC TREATMENT In his 1933 monograph of the genus, Hitchcock described the taxonomic and nomenclatural history of Nama. Majo.r points of his treatise are summarized below. In 1753, Linnaeus described the genus Nama and the species !i· zeylanicum. He described a second species,!· jamai­ cense in 1759. In 1763, he transferred~- zeylanicum to the genus Hydrolea and published the binomial H. zeylanica. Nama jamaicense was left in Nama. In the 1800's, additional species were described by Choisy, Gray, Hemsley, and others. In 1871, Watson described the genus Conanthus into which Heller in 1898 subsequently transferred numerous western U.S. species of Nama. Recognizing that the type species of Nama--N. zey- lanicum--had been transferred to another genus-- Hydrolea-- 1 Kuntze, in 1891 proposed that Nama be used only for !i· zeylanicum and other species of Hydrolea, and that all other species of Nama, including !i· jamaicense, be positioned in the new genus Marilaunidium. Because of the problem created by Linnaeus when he transferred the type species of Nama to Hydrolea and the taxonomic and nomenclatural ambiguity surrounding Nama, 6 7 the 1906 International Botanical Congress conserved the generic name Nama to include~· jamaicense as.the type. Conanthus and Marilaunidium thus became synonyms. Nama was revised in the 1800's by Choisy and Gray. The latter published many revisions of various taxa. In 1861 he examined the species of Nama known to him and on the basis of leaf position on the stem, leaf morphology, pubescence, and inflorescence type recognied eight species. He continued his work and in 1862 described two new species of Nama. In 1870, Gray revised his previous work, added new information, and using mainly the same characters, recog­ nized 15 species, four of which were new. In his treatment of the Hydrophyllaceae, Brand in 1913 again revised the genus. There were 2 subgenera, 2 sec­ tions, 36 species, 4 subspecies, 15 varieties, 6 forms and 1 hybrid recognied in this revision. He reduced the genus Conanthus to a subgenus of Nama with seven species characterized by united styles. He also reduced Marilauni­ dium to a subgenus with two sections comprising the remaind­ er of the species which are characterized by free styles. In distinguishing between the two sections, he used the level of stamen filament insertion from the corolla base. Species were differentiated from each other mainly by leaf length and serration, corolla length, stamen filament charac­ ters, and number of ovules. Brand in his treatment of the Hydrophyllaceae segre­ gated Andropus from Nama as a new genus. Unfortunately, 8 as Hitchcock Cl933a) points out Brand misinterpretated the stamen filament bases of Nama. Another new genus-­ Turricula--was proposed by Maedrib in 1917 to include N.
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